Browsing Brage IMR by Author "Skaala, Øystein"
Now showing items 1-20 of 106
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A comparison between three Atlantic salmon river stocks; using classical population genetics, differences in life history traits and performance in sea ranching
Skilbrei, Ove; Skaala, Øystein (ICES CM Documents;1997/P:13, Working paper, 1997)Characterisation of stocks is essential for fisheries and environmental management in order to conserve genetic diversity. However, classical populationgenetic methods frequently fail to document stock differences. In ... -
A conservation plan for Atlantic salmon (Salmo salar) and anadromous brown trout (Salmo trutta) in a region with intensive industrial use of aquatic habitats, the Hardangerfjord, western Norway
Skaala, Øystein; Johnsen, Geir Helge; Lo, Håvard; Borgstrøm, Reidar; Wennevik, Vidar; Hansen, Michael Møller; Merz, Joseph E.; Glover, Kevin A.; Barlaup, Bjørn T. (Journal article; Peer reviewed, 2013-10-15)Extensive use of aquatic habitats, mainly for hydropower and aquaculture, has a negative impact on anadromous salmonid populations of the Hardangerfjord region, western Norway. High infection levels of salmon lice, and ... -
A genetic marker for artificially reared cod (Gadus morhua L.)
Jørstad, Knut Eirik; Øiestad, Victor; Paulsen, Ole Ingar; Naas, Kjell Emil; Skaala, Øystein (ICES CM Documents;1987/F:22, Working paper, 1987)Artificially reared cod at the Aquaculture Station Austevoll on the west coast of Norway, were screened for genetic markers by using biopsies of white muscle, individual tags and enzyme genotype as determined by starch ... -
A method of observing the spawning behaviour of farmed and wild salmonids in a natural stream habitat
Skaala, Øystein; Jørstad, Knut Eirik; Fernö, Anders (ICES CM Documents;1993/M:21, Working paper, 1993)When farmed fish escape from farms, they may compete with wild individuals for a number of resources, such as food, spawning sites, and mates. As a part of a larger study on genetic impact from farmed fish on wild ... -
A summary of 20 years (1998-2017) of scientific work on genetics and survival in anadromous brown trout (Salmo trutta L) and Atlantic salmon (S. salar L) in the river Guddalselva western Norway
Skaala, Øystein (Fisken og Havet;Nr. 5 - 2017, Research report, 2017) -
An assessment of the spatial scale of local adaptation in brown trout (Salmo trutta L.): footprints of selection at microsatellite DNA loci
Meier, K.; Hansen, M.M.; Bekkevold, Dorte; Skaala, Øystein; Mensberg, K-L.D. (Journal article; Peer reviewed, 2011-01-12)Local adaptation is considered a paradigm in studies of salmonid fish populations. Yet, little is known about the geographical scale of local adaptation. Is adaptive divergence primarily evident at the scale of regions or ... -
An assessment of the spatial scale of local adaptation in brown trout (Salmo trutta L.): footprints of selection at microsatellite DNA loci
Meier, K.; Hansen, M.M.; Bekkevold, Dorte; Skaala, Øystein; Mensberg, K-L.D. (Journal article; Peer reviewed, 2011-01-12)Local adaptation is considered a paradigm in studies of salmonid fish populations. Yet, little is known about the geographical scale of local adaptation. Is adaptive divergence primarily evident at the scale of regions or ... -
An extensive common‐garden study with domesticated and wild Atlantic salmon in the wild reveals impact on smolt production and shifts in fitness traits
Skaala, Øystein; Besnier, Francois; Borgstrøm, Reidar; Barlaup, Bjørn Torgeir; Sørvik, Anne Grete Eide; Normann, Eirik; Østebø, Britt Iren; Hansen, Michael Møller; Glover, Kevin (Journal article; Peer reviewed, 2019)Interactions between domesticated escapees and wild conspecifics represent a threat to the genetic integrity and fitness of native populations. For Atlantic salmon, the recurrent presence of large numbers of domesticated ... -
Annual report on health monitoring of wild anadromous salmonids in Norway 2017
Madhun, Abdullah Sami; Skaala, Øystein; Nilsen, Rune; Serra-Llinares, Rosa Maria; Elvik, Kristine Marit Schrøder; Bjørn, Pål Arne; Karlsen, Ørjan; Svåsand, Terje; Karlsbakk, Egil (Rapport fra havforskningen;26-2018, Research report, 2018)Svært få funn av virus i tilbakevandrende laks selv om de samme virusene er vanlige i oppdrett Havforskningsinstituttet har undersøkt forekomsten av flere virus som er prevalent i oppdrett i tilbakevandrende laks fra ... -
Arvemateriale frå oppdrett og havbeite - problem for ville fiskestammar?
Skaala, Øystein (Havforskningsnytt, Working paper, 1993) -
Atlantic salmon and sea trout display synchronised smolt migration relative to linked environmental cues
Harvey, Alison C.; Glover, Kevin; Wennevik, Vidar; Skaala, Øystein (Peer reviewed; Journal article, 2020)Anadromous salmon and sea trout smolts face challenging migrations from freshwater to the marine environment characterised by high mortality. Therefore, the timing of smolt migration is likely to be critical for survival. ... -
Atlantic salmon populations invaded by farmed escapees: quantifying genetic introgression with a Bayesian approach and SNPs
Glover, Kevin A.; Pertoldi, Cino; Besnier, Francois; Wennevik, Vidar; Kent, Matthew; Skaala, Øystein (Journal article; Peer reviewed, 2013-08-23)Background Many native Atlantic salmon populations have been invaded by domesticated escapees for three decades or longer. However, thus far, the cumulative level of gene-flow that has occurred from farmed to wild salmon ... -
Ballastvatn i skip spreier uønska artar
Jelmert, Anders; Skaala, Øystein (Havforskningstema, Working paper, 1998) -
Betydninga av lange tidsseriar i forvaltningsrelatert havbruksforsking: Sjøaure i Hardangerfjorden - Årlege svingingar i antal og vekst hos parr og vekst hos postsmolt
Borgstrøm, Reidar; Skaala, Øystein (Fisken og havet, Research report, 1999)The report includes studies on numbers, growth and survival of seatrout and salmon par in River Øyre, Kvinnherad from 1988 to 1998. The abundance of -
Caught in the trap: over half of the farmed Atlantic salmon removed from a wild spawning population in the period 2014−2018 were mature
Madhun, Abdullah Sami; Harvey, Alison C.; Skaala, Øystein; Wennevik, Vidar; Knutar, Sofie; Solberg, Monica Favnebøe; Quintela, Maria; Andersen-Fjeldheim, Per Tommy; Meier, Sonnich; Glover, Kevin Alan (Peer reviewed; Journal article, 2023)Whilst aquaculture continues its global expansion, containment of fish in sea cages remains a persistent environmental challenge. Within Atlantic salmon Salmo salar farming, widespread escapes over several decades have ... -
Coastal releases of Atlantic salmon, a new model for salmon ranching in Norway
Holm, Marianne; Jørstad, Knut Eirik; Skilbrei, Ove; Pedersen, Tom N.; Skaala, Øystein; Nortvedt, Ragnar (ICES CM Documents;1991/M:38, Working paper, 1991)The present project is launched within the frame of a 7 year government funded programme to establish an additional livelihood for the coastal regions. The aim of the study is, through controlled experiments, to find ... -
Cryptic introgression: evidence that selection and plasticity mask the full phenotypic potential of domesticated Atlantic salmon in the wild
Glover, Kevin; Solberg, Monica Favnebøe; Besnier, Francois; Skaala, Øystein (Journal article; Peer reviewed, 2018)Domesticated Atlantic salmon grow much faster than wild salmon when reared together in fish tanks under farming conditions (size ratios typically 1:2–3). In contrast, domesticated salmon only display marginally higher ... -
Differential changes in growth patterns of anadromous brown trout and Atlantic salmon from the River Etneelva over a 25-year period
Fjørtoft, Helene Børretzen; Borgstrøm, Reidar; Skaala, Øystein (Journal article; Peer reviewed, 2013-10-15)Freshwater and marine growth of anadromous brown trout (Salmo trutta) and Atlantic salmon (Salmo salar) from the River Etneelva was analysed in relation to river, fjord and ocean temperatures during the periods 1976-1982 ... -
DNA and scale reading to identify repeat spawning in Atlantic salmon: Unique insights into patterns of iteroparity
Kaland, Håvard; Harvey, Alison C.; Skaala, Øystein; Wennevik, Vidar; Besnier, Francois; Andersen-Fjeldheim, Per Tommy; Knutar, Sofie; Andersen-Fjeldheim, Kaja Christine; Glover, Kevin Alan (Peer reviewed; Journal article, 2023)Iteroparity represents an important but often overlooked component of life history in anadromous Atlantic salmon. Here, we combined individual DNA profiling and scale reading to identify repeat spawners among ~8000 adult ... -
Does Domestication Cause Changes in Growth Reaction Norms? A Study of Farmed, Wild and Hybrid Atlantic Salmon Families Exposed to Environmental Stress
Solberg, Monica Favnebøe; Skaala, Øystein; Nilsen, Frank; Glover, Kevin A. (Journal article; Peer reviewed, 2013-01-31)One of the most important traits linked with the successful domestication of animals is reducing their sensitivity to environmental stressors in the human controlled environment. In order to examine whether domestication ...